Edward jewett



glatten tatrs platrnt @Hita EDWARD JEWETT, OF RINDGE, ANEW HAMPSHIRE.

ALetcrs Patent No. 78,458, dated Tune 2, 1868; cmtedate'rl May 18, 1.868.

IMPROVEMENT IN VENEEB-GUTTING MACHINES.

'dite tlgrhnlc tratta tu it tipa ttttas lintent mit uniting artt at its smite.

TO ALL WHOM IT MAY CONCERTI:

Be it known that I, EDWARD JEWETT, oi Rindge, in the county of Cheshire, and State of New Hampshire, have invented a new and useful Improvement in Face-Lumber Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which f Figure 1 is a side elevation,showing the carriage, bolt, and cutter in position.

Figure 2 is a side elevation, showing the ribs more distinctly.

Figure 3 shows the common method ofsecuring the bolt to the carriage.

Figure 4 is a perspective view of a portion of the carriage, showing one rib in position.

Figures 5 and 7 are vertical sections through the carriage and ribs.

Figure 6 is a plan view oi' the carriage. Y

My invention relates to the method of securing the bolt to the carriage; and it consists in dove-tail ribs projecting from. the faceot the carriage, and entering corresponding grooves in the face of the bolt,.whereby it is held more securely, and with less loss of time and material than hitherto. I

That others may understand the construction, operation, and advantages of my improvement, I will parteularly describe it, and the methods in common use for the same purpose.

In describing my machine and its operation, it will, for convenience, be described as cutting veneers, though the term veneer might not technically be applicable to its products.

In fig. 1 is represented so much of. a working veneer-cutting machine as will exhibit the relative positions ofthe carriage, bolt, and cutter. The carriage is reciprocated by a crank and pitman, or by some other effective device. The carriage may be fed toward the knife or the knife toward the carriage, as may be deemed preferable, and this'may be accomplished by a screw, lever, or other means.

In all machines of this class at present in use, the bolt is secured to the carriage by screws, as shown in iig. 3. These screws are inserted through holes in the carriage, and penetrate to a depth of one and a quarter inch, or more. In cutting veneers-5 Alle., the bolt is always thoroughly heated, and moistened by the application of steam, and much time is consumed in attaching it to the carriage, because the holes must be bored and thc screws inserted after steaming, so that the temperature is always considerably reduced before it is ready for the application of theknii'e. This is a material disadvantage in several particulars. The loss of time in attaching thebolt, the loss of temperature while being attached, and the loss of stock, as that portion ofthe bolt penetrated by the screws is worthless, this latter loss being several dollars in the value of each bolt ot such woods as are ordinarily cut into veneers.

With my device the bolt is not only held more firmly to the carriage, but it may be attached without any loss of time or temperature, and the waste may bc reduced to less than one-fifth of what it must be where screws are used.

In the iigures, A represents the carriage, B the b OIt, and in iig. 3 is the screw, as commonly used to attach the bolt `to the carriage. On the face of my carriage, A, are placed several ribs, D, having dove-tail sections, as shown in hg. 2, and these ribs may not project more than onc-fourth of an inch above the surface of the carriage. Corresponding grooves are cut in one face of the bolt, transversely to the grainof the wood, andat intervals to correspond with the distances between the ribs, and when said bolt is to be attached ...to the carriage, it is so introduced asto cause. the ribs D to enter their appropriate grooves, and the bolt will be securely held in position. l

The number ot' the ribs D is not material, but I think intervals of six inches would be proper when soft woods are to be used, and longer intervals for hard woods. l

The grooves in the bolt maybe made by any instrument capable of cutting under," in the manner shown, as expanding bits, revolving cutters, fcc., and these may be mounted in gangs, with a suitable carriage, so that the whole set of grooves may be made all at one time. They may also be made before the bolt is submitted to the steaming process. But it will not always he possible to make these grooves so exact that the bolt will be rigidly attached in this way, and I therefore maire the ribs slightly. tapering, as shown in figs.

4 and 6, and by the use of a proper guide attached to thc carriage of the dove-tail cutter, the grooves in the bolt will all be made to correspond with as much ease as they could be made straight. The bolt will slip upon these tapered ribs and wedge fast at some point, and there be held perfectly secure.

x When thus retained, there can be no danger that the holt will work loose, because every time the knife enters the-wood the wedging of the ribs in their grooves will be more firm.

It will frequently occur that it will be desirable to adjust some of the ribs D endways, either so that one or more of them may be set alittle in advance of others, to cause them to ll their grooves, or to bring the holt upon particular portions of thecarriage. The-.method of accomplishing this adjustment is clearly shown in figs. 4, 5, and 6, where the'rihs arefshown as running in grooves out in the carriage, and setwat any Aparticularpoint by means of a. set-screw, E, which passes upward through the slots F into the ribs, and clamping -them iirmly to the table at any desired point.

It may sometimes b e desirable to be able to place a holt upon the carriage in the reverse direction, and this-may he easily accomplished by reversing the ends of the ribs, which can readily be done by withdrawing them from their grooves and entering their opposite ends. i

The grooves inthe bolt should be cut toa depth a little greater than the height of the rib, as shown in figs. 1, 2, and 7, so that, in placing the bolt upon the carriage, the top surfaces of the ribs shall not come in contact with the bolt This will lessen the friction, and diiiculty of putting the bolt in place, and will also obviate any tendency to split the portion between the ribs away from lthe mainblock.

The operation of the inclined sides of the ribs is entirely directed toward that portion of the bolt/ which is opposed to them, and the pressure of one rib against the wood of the holt is counterbalanced by the pressure of the next rib in the opposite direction, and there is therefore no tendency to split the belt."

It may be found advantageous to arrange the ribs in the manner shown in iig. 7, in which the rib D may have a slight vertical movement in its groove in the carriage, and may be drawn down intov said groove with power by the screw E. If arranged in this way, the rib'above the carriage may be madev of the same width at.

the two ends, instead of tapering, and when the bolt is placed upon the carriage it may be held there securely by tightening up the screws E, (fig. 7,) which will. clamp those portions of the bolt which are beneath the inclined sides of the rib. y V

Springs of rubber, or of wire, may be inserted under the ribs D, (iig. 7,) to keep ,there lifted as far as the screws E will permit, so as to facilitate the placing of the holt in position upon the carriage.A

Having described my invention, and its mede of operation, what I claim as new, is-

Attaching and securing the bolt to the carriage A by means of dove-tailed ribs D D, substantially as.

and for the purpose set forth.

The adjustable ribs D D, moving in grooves cut in the carriage A, and secured by set-screws, or their equivalent, substantially as and for the purpose set forth.

The vertically-adjustable clamping-rib,'(fig. 7,) substantially as 'and for the purpose set forth.

l EDWARD JEWETT. Witnesses:

R. D. 0-. SMITH, D. B. VENTRE, Jr. 

